25615628307978 has 16 divisors (see below), whose sum is σ = 52615885173600. Its totient is φ = 8307771343056.

The previous prime is 25615628307961. The next prime is 25615628308021. The reversal of 25615628307978 is 87970382651652.

It is a super-2 number, since 2×25615628307978² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57692856328 + ... + 57692856771.

It is an arithmetic number, because the mean of its divisors is an integer number (3288492823350).

Almost surely, 2^{25615628307978} is an apocalyptic number.

25615628307978 is an abundant number, since it is smaller than the sum of its proper divisors (27000256865622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25615628307978 is a wasteful number, since it uses less digits than its factorization.

25615628307978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115385713141.

The product of its (nonzero) digits is 304819200, while the sum is 69.

The spelling of 25615628307978 in words is "twenty-five trillion, six hundred fifteen billion, six hundred twenty-eight million, three hundred seven thousand, nine hundred seventy-eight".